[Twiz O'meter/BigToM/ToM+] Fix for occasionally boot failure or shutdown.

A few ToM+ users reported me occasionally boot failures (ToM+ doesn't start when turning the key) or unmotivated shutdowns especially while charging.
After several tests (thank to Snorre for the detailed investigation), we came to the conclusion that it's not an hardware neither a software defect.
Simply: my ToM device has an overheat protection, so in these so hot days the protection is triggered, especilly for the ToM+ which is installed in the gloove-box.
Since the temperature treshold for the protection is set prudently with some margin, I increased it a little (+5°), so to prevent the problem.
Who is experimenting such situation can safely update with the attached firmware. It's also suitable for ToM and BigToM.
If it won't be enough, I'll increase the treshold a little more.